Index: public/wp-includes/class-wp-admin-bar.php
===================================================================
--- public/wp-includes/class-wp-admin-bar.php	(revision 17206)
+++ public/wp-includes/class-wp-admin-bar.php	(working copy)
@@ -157,7 +157,7 @@
 	}
 
 	function add_node( $parent_id, &$menu, $child ) {
-		foreach( $menu as $id => &$menu_item ) {
+		foreach( $menu as $id => $menu_item ) {
 			if ( $parent_id == $id ) {
 				$menu->{$parent_id}['children']->{$child['id']} = $child;
 				$child = null;